Navel secretion of foreign body may be cleaning is not in place, umbilical cord inflammation and umbilical ureteric cyst infection and other causes. 1. Cleaning is not in place: the location of the navel is relatively deep, so the local shedding of dead skin and skin secretion of oil, it is easier to accumulate in the navel. If the cleaning is not in place, it will lead to the navel secretion of foreign matter more. 2. Umbilicitis: When patients violently pick and rub the umbilicus or repeatedly press the umbilicus, it may lead to skin damage that can easily lead to infection, namely, umbilicitis, which will lead to increased secretion and pain in the navel. 3. Umbilical ureteric cyst infection: a congenital disease, the umbilical ureter atresia at both ends and the middle part of the lumen remnants of the formation of cysts, large umbilical ureteric cysts can be compressed intestinal infections, which leads to the symptoms of the navel secretion of the foreign body more. When the patient appeared in the navel secretion of foreign body, it is recommended to go to the regular hospital in a timely manner. Daily to keep the navel clean and dry, the navel can not be excessive cleaning and hard to pick.